According to writers Judith and Garfield Reeves-Stevens in a special features segment in ENT Season 4 DVD, the establishment of the Andorian homeworld as a moon orbiting a gas giant was devised to help explain the contradiction of why it was sometimes called Andor and sometimes it was called Andoria. They explained that it could be both and that they had hoped to establish the gas giant as Andor and the moon as Andoria.

This uninhabited planet was more than a hundred light years from Earth and more than twenty light years from the Takret system. It teemed with all sorts of plant and animal life. Its southern continent featured a gorge five times deeper then the Grand Canyon. Due to its binary suns it experienced night only four days a month.

The crew of the Enterprise NX-01 was planning to explore the planet in 2152 when instead they were forced to take shelter in its orbit from a class five neutronic wave front. (ENT: "The Catwalk")

The Enterprise NX-01 surveyed a planet containing ruins of an extinct humanoid species in 2152. The ruins consisted of several underground chambers, some of them 4,000 years old. The planet experienced intense diamagnetic storms from time to time. (ENT: "Vanishing Point")

In 2151, the Enterprise NX-01 visited this gas giant planet and found a disabled KlingonRaptor-class ship slowly descending through the layers of the gas giant planet's atmosphere. The crew managed to save the ship just before it buckled under the stress of the extreme pressure of the planet's atmosphere. (ENT: "Sleeping Dogs")

In 2151, a trader gave Enterprise NX-01 the coordinates of a planet that had an abandoned ship for spare parts, but warned that the ship was haunted. Upon arriving at the unnamed planet, they discovered it was not haunted, but was in fact a ship of holograms (and two living people), that the Kantare supply ship had crashed on, about half way between Kantare and their colony on Kotara Barath. It had at least one moon. (ENT: "Oasis")

This unnamed planet was where first contact between the Federation and the Kelvans was made in 2268. The planet's atmosphere was capable of supporting humanoid lifeforms. The planet had one moon. The planet was not too far from the edge of the Milky Way Galaxy, being "within an hour" of the outer barrier - at warp 11.

In that year, a Kelvan ship from the distant Andromeda Galaxy had crash-landed on this planet. Their multi-generational ship had taken only three Earth centuries to cross over from their endangered homeworld Kelva, but could not come through our galaxy's energy barrier intact. The survivors, who had been born in transit and known no other environment, were forced to take shelter here. Sensing a Federation starship was near, they took Human form in anticipation of appropriating the vessel. But they were not yet Human enough to feel comfortable in their surroundings. Rojan called it "this accursed planet" and his lieutenant Hanar said it was "an undisciplined environment." On the other hand, Kelinda did find one of the planet's flowers to be like a Kelvan crystal seen in the record banks of their lost intergalactic ship.

The Kelvans transmitted a distress call which was picked up by the USS Enterprise. A landing party, led by CaptainJames T. Kirk, made first contact with the Kelvans who subsequently took them captive. After a failed escape attempt, which resulted in the death of YeomanLeslie Thompson, the Kelvans commandeered the Enterprise for a return trip to the Andromeda Galaxy. After Captain Kirk had convinced the Kelvan leader, Rojan, to release the ship, the Enterprise returned to this planet with the hopes that Rojan and his people could establish a colony for their people. (TOS: "By Any Other Name")

In December of 2154, Enterprise encountered an Orion trader called Harrad-Sar. He invited an away team from Enterprise to beam aboard his ship, where he told CaptainJonathan Archer of a planet rich in magnesite that his vessel had detected. His ship was incapable of removing the magnesite from beneath the planet's surface, so he requested the help of Enterprise. When the starship proceeded to the planet, it was attacked by an Orion ship. Although Harrad-Sar's claim held true – the planet did contain large quantities of magnesite – he later attacked Enterprise and revealed that his plan had always been to disable the NX-class starship. (ENT: "Bound")

Later the Defiant was in orbit of a Brown planet. From there, it went to the third planet in the same system.

At the very end of the allotted time, one more shuttle was detected, leading the Defiant to yet another planet, where Benjamin Sisko was retrieved. Its day was between 22 and 23 hours in length. (DS9: "Waltz")

In an expanding field of Delphic Expanse anomalies, T'Pol located a planet that had once been inhabited, but now had not a single lifeform due to being engulfed in the field some time before December 2153. Its location was within a few hundred million kilometers of a point equidistant to five of the Delphic Expanse spheres. (ENT: "Harbinger")

Based on the diameter of the anomaly of seven hundred million kilometers, and assuming that the rate of expansion of "several" (i.e. at least three) kilometers per second was constant, a quick calculation suggests that the planet was engulfed at the latest about three and a half year before December 2153.

This planet was selected by the Metrons for the resolution of a dispute between the Federation and the Gorn. The planet had a suitable atmosphere for both combatants. The planet's surface was populated by scrub bushes, rocks, and mineral deposits. (TOS: "Arena")

Although the Metrons referred to this place as a planet, Captain Kirk once described it as an asteroid.

In the script of the episode, the Enterprise-D was in orbit of this planet at the beginning of the episode, too. The planet was identified as Starbase 27. The USS Potemkin transported Doctor Russell to the Enterprise-D while the latter was still in orbit of Starbase 27. In the actual episode, the Enterprise is never seen in orbit of the planet at the beginning of the episode and the starbase is never mentioned; instead, the ships rendezvous in open space. This leaves the possibility that the unnamed planet seen at the end of the episode is Doctor Russell's home base, where the Adelman Neurological Institute was located.

This ice-covered world, just outside the Alpha Quadrant, was the crash site of USS Voyager in an alternate timeline. (VOY: "Timeless")

The planet was said to be outside the Alpha Quadrant, but it was close enough to travel to. Therefore we here assume, even if it was not explicitly said, that it was in the Beta Quadrant (as opposed to a Delta Quadrant location.

This uninhabited class M planet had been under observation by Organians for ten millennia. A deadly silicon-based virus was present on the planet, and the Organians used visitors reaction to the infection as a litmus test to see if visiting species had enough rational intelligence to be ready for first contact.

Among the visitors to the planet who had been infected with the virus were Cardassian and Klingon crews. The Klingons had visited several years before 2154, and had been killed by their own commander in a shuttlecraft, the remains of which still orbited the planet.

The Rock Creature planet was located in an uncharted planetarysystem. This system was a binary star system. The planet was classified as M-class. The atmospheric pressure on the surface was 800 millibars; gravity was 1.2 times that of Earth, and the average temperature was hot. Though there was no intelligent life on this planet, the planet was inhabited by rock creatures.

This planet is one of the four uninhabited planets in the Selcundi Drema sector. It is not suitable for colonization due to severe geological activity and is expected end up like Drema V. Several planets were surveyed by the USS Enterprise-D in 2365. (TNG: "Pen Pals")

This planet is presumably Drema I as the depiction fits the mention of Drema I as having "massive volcanic activity".

This planet was the homeworld of a species resembling the Earth slug and had an atmosphere that was rich in argon. In 2151, the planet was visited by an away team from the NX-class Enterprise that included EnsignHoshi Sato, who took one of the planet's slug-like inhabitants, which she named "Sluggo", with her when she returned to Enterprise. (ENT: "Fight or Flight")

Since Sluggo was found before Enterprise traveled to Archer IV (the first M-class planet to be surveyed by the ship's crew), it is reasonable to assume that the creature's homeworld was not an M-class planet. Given that the creature was from a planet with an argon-rich atmosphere, it is possible that its homeworld was a class H planet.

The planet had a moon or a large neighboring planet. In early 2152, after Enterprise had been infected with a symbiotic lifeform, they were able to find the location of its homeworld with the help of the Kreetassans.

Upon finding the planet, an away team went down to return the lifeform, and its severed tendril that Phlox examined, to the larger creature that took up much of the planet. (ENT: "Vox Sola")

This system contained at least three planets. One of them was detected to have undergone an orbital shift by Starfleet, taking it between two gas giants. The gas giants' influence was expected to superheat the core of this planet, covering the planet with erupting volcanos in no time. Enterprise was ordered by AdmiralForrest to study it. While the planet initially appeared lifeless, the seismic activity unearthed subterranean microbes. (ENT: "Horizon")

The Taureans built for themselves an advanced civilization, including a temple and numerous other architectural wonders. Unfortunately, these new inhabitants did not know at the time that the planet drained humanoid energy. The women's bodies were able to develop a glandular secretion that enabled them to survive and to manipulate certain areas of the males' brains to influence their emotions, ultimately draining the men. This caused the men to weaken and eventually die. The female Taureans realized that, in order to survive, they had to revitalize every 27 years, as they became eternal prisoners of the planet. They were neither capable of aging, dying, or bearing children. They revitalized themselves by means of summoning male crew members of starships from as far as twenty light years away.

In 2269, the USS Enterprise was investigating several disappearances within range of Taurean system when they fell victim to their summons. After reaching an agreement with the Taureans, the crew of the Enterprise arranged for Starfleet to send a ship crewed by women. These women would transport the Taureans to a suitable planet where they could live out their lives as mortal women. (TAS: "The Lorelei Signal")

The novelization of "The Lorelei Signal" depicted this planet as having rainstorms that are "typically sudden."

The trellium mining planet was located about a six-week journey inside the Delphic Expanse. Trellium-D was mined there. The atmosphere of the planet was extremely polluted; many of the staff wore respirators and sustained survival on the surface was impossible. Members of thirty-one different species worked in the mines in some capacity.

It turned out to be a trap, however. The miners worked by capturing ships and forcing their crew to work as slaves. Enterprise was barely able to escape, but Kessick died in the attempt. (ENT: "The Xindi")

Enterprise had been exploring this planet for three days in March 2153 when they were forced to recall their three surface science teams to pursue a bounty hunter who had captured their captain. They had also put down a number of crewmen on it for shore leave.

Among the planet's most enjoyable regions were equatorial range, including a north summit with an inspiring view. In the north there was the Rykos shoreline, the southern tip of which was 227 kilometers from the polar island chain. These islands featured a pyroclastic debris field, lava tubes, and the hydrothermal pools of Ren-gham. The planet also featured ravines. However, as Skalaar mentioned these things after learning Archer's name, it is possible he made these features up to earn Archer's trust and be able to kidnap him.

The planet was known to the Vulcans since at least the early 1st millennium BC. The construction there of P'Jem, later consecrated to the memory and teachings of Surak, predated the Time of Awakening by over twelve centuries.

The planet was, perhaps more importantly, the site of the first association of Andorians and Humans, in the persons of Shran and Jonathan Archer. Their grudging partnership played no small part in bringing about the UFP Charter ten years later.